tmf.ui: callstack - replaced multiple single SS queries by full query

tmf.ui: callstack - replaced multiple single SS queries by full query

CallStackView would do a single query for every thread,
at the start of the statesystem, or at the end of the
statesystem.
This patch replaces all single queries in buildEntryList
by two full queries and reads to the result of those queries

Change-Id: Id59b355fd84bfc0b8e30ef3f3f375f8ca0dbe634
Signed-off-by: Loïc Prieur-Drevon <loic.prieurdrevon@gmail.com>
Reviewed-on: https://git.eclipse.org/r/70854
Reviewed-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>